Learning RxJava

Making a Supplier a lambda

Lambdas can also implement methods that return items. For instance, the Supplier class introduced in Java 8 (and originally introduced in Google Guava) has an abstract get() method that returns a T item for a given Supplier<T>. If we have a Supplier<List<String>> whose get() returns List<String>, we can implement it using an old-fashioned anonymous class:

import java.util.ArrayList;import java.util.List;import java.util.function.Supplier;public class Launcher {    public static void main(String[] args) {        Supplier<List<String>> listGenerator = newSupplier<List<String>>() {            @Override            public List<String> get() {                return new ArrayList<>();            }        };                List<String> myList = listGenerator.get();    }}

But we can also use a lambda, ...